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US3778235A
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Nitride-strengthened stainless steel composite
Assignee: Allegheny Ludlum Corp
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Filing: 1971-11-19
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Granted: 1973-12-11
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Expires: 1991-11-19
Abstract
Abstract The application describes composite members containing a plurality of layers at least one of which is nitride strengthened stainless steel and a pressure bonding method for producing them.
Inventors
- 👤 L Kindlimann
- 👤 A Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:16
CPC Classifications
C; C22; C22C; C22C38/00; B; B32; B32B; B32B15/00; B32B15/01; B32B15/011; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12653; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12951; Y10T428/12972; Y10T428/12979; Y10T428/12986
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
A composite member according to claim 1 wherein an additional layer consists essentially of a nitride-strengthened, stainless steel containing as a dispersoid therein particles of a metal nitride present at an interparticle spacing of less than 10 microns and having a free energy of formation of greater than -21,000 cal/mole.
Claim 2
Dependent Claim
18 words
A composite member according to claim 1 wherein an additional layer consists essentially of a precipitation hardening alloy.
Claim 3
Dependent Claim
18 words
A composite member according to claim 1 wherein an additional layer consists essentially of a corrosion resistant alloy.
Claim 4
Dependent Claim
18 words
A composite member according to claim 1 wherein an additional layer consists essentially of an oxidation resistant alloy.
Claim 5
Dependent Claim
84 words
A composite member comprising a first metallic layer metallurgically pressure bonded to at least one additional metallic layer from the group consisting of nickel alloys, plain carbon steel and stainless steel; said first layer consisting essentially of a chromium and nickel containing nitride-strengthened, stainless steel containing as a dispersoid therein particles of nitride of metal from the group consisting of titanium, aluminum, vanadium and columbium present at an interparticle spacing of less than 10 microns; said first layer being less than 10 mils thick.
Claim 6
Dependent Claim
13 words
A composite member according to claim 6 wherein said dispersoid is titanium nitride.
Claim 7
Dependent Claim
23 words
A composite member according to claim 6 wherein said dispersoid particles are present at an interparticle spacing of less than about 2 microns.
Claim 8
Dependent Claim
60 words
A composite member having a strength of at least 8 ksi at 2, 000*F comprising at least two pressure bonded metallic layers; said layers consisting essentially of chromium containing nitride-strengthened, stainless steel containing as a dispersoid therein particles of titanium nitride present at an interparticle spacing of less than about 2 microns; said layers being less than 10 mils thick.
Claim 9
Dependent Claim
17 words
A composite member according to claim 9 wherein said composite is in excess of 10 mils thick.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |